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### Question

If the speed of a boat in the direction of the stream current is 16 km/h, and the speed of the current is 4 km/h, what would be the speed of the boat against the current?

**A**

8 km/h.

**B**

9 km/h.

**C**

7 km/h.

**D**

11 km/h.

**Soln.**

**Ans: a**

Speed of the boat in still water is the difference between its downstream speed and the speed of the stream, which is 16 - 4 = 12 km/h. Hence, the speed of the boat against the current is 12 - 4 = 8 km/h.